DNA specific air filter for Royal Enfield Himalayan 411 (16-21) The specific DNA air filters are built specifically to increase horsepower and acceleration of your bike by guaranteeing a large filtering capacity. These washable filters are designed to fit your motorcycle's stock airbox, yet offer improved airflow with nearly 99% filtration efficiency over the stock filter. Installing the filter is very easy because you just need to follow the instructions in your motorcycle manual. They are the best on the market to ensure greater performance for your bike. Features: Material: 4-layer DNA cotton Filtering efficiency: 98-99% Filter properties: washable Compatible with: Royal Enfield Himalayan 411 (16-21)